Determination of the position of the fourth ventricle on arteriograms of the vertebral arterial system.
D000328:Adult; D001932:Brain Neoplasms / Q000000981:diagnostic imaging; D002528:Cerebellar Neoplasms / Q000000981:diagnostic imaging; D014695:Cerebral Ventriculography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011011:Pneumoencephalography; D011149:Pons; D014711:Vertebral Artery / Q000000981:diagnostic imaging*